I never thought Ross/Rachel were bad for one another. They just went through a long trajectory and tbh, I just got annoyed the last couple of times they broke up.
For me, the best will/won’t couple was Mal and Inara in Serenity.
In my current book, I didn’t decide that Volya/Liam will end up together till the end, particularly when I took it out of BL section. Romance requires a happy ending, and I wasn’t sure I wanted it.
But, in the end, I feel like in a story with a lot of focus on romance, getting together makes a better ending.